[SI-LIST] 10 BASE-T RJ45 PCB Design information

Hi George,

"Peterson, George W" wrote:
> 
Did you have any luck with your question? The wide use of 10 BASE-T
should guarantee interest so I'm not sure why there was no response. If
you received something off line and cared to share I, for one, would
appreciate it!
> 
> Thanks, George
----------------
I got very useful responses to my 10 BASE-T RJ45 PCB Design information
off-line. You are right in that others might be interested in the
responses I got.    

Intel has a pretty detailed write up on their website for their 82559
10/100 TX chip that could be generalized.

Try the following web page at Intel.  On the right side of the table are
links to documents.  There are some good practical design guidelines in
these and embedded in the schematic documentation.
http://developer.intel.com/design/network/products/ethernet/linecard_ec.htm

Your best sources are the app notes of PHY vendors as they don't want to
take the blame for a problem. An excellent intro/app note can be found
on the Intel website for their family of LXT97x parts (used to be
Level One).

Here is a suggestion:
Look at data sheets and application notes from vendors who sell the
chips for implementing 10 Base-T.    I used chips from AMD and Intel for
a 10 Base-T interface nearly 10 years ago.  I can't remember too much
about the connector part.  The requirements are probably not too severe
since the frequency is relatively low.

One other item I recall: you can implement two BNC connectors (one "in"
and one "out")  or you can implement a single BNC connector and require
the use of a T-connector externally.

peter> I thanked the people who provided this off-line. FYI.

I was looking for a "no-brainer" decent-speed, convenient, PC link (not
a web page or any of that). I was looking at a serial (RS232-like) to
ethernet module, like the Dallas TINI (US$50), to put into a product -
as an option. However the TINI approach requires too many residual parts
(magnetics, connectors, HV caps) to be supplied (US$6-US$8), that adds
to the basic cost of each product, if they don't want the option.

While looking, I discovered the FTDI  FTDIchip.com "no-brainer" USB chip
(US$3 per 1000) that connects to your processor like a UART. They have a
PC driver software (free) for the PC side. It handles all USB protocol
stuff for you. You just write and read the data you want. An elegant
solution. But they don't mention USB si or emc issues on their web site.
Apart from the usual, are there any USB specific issues?

I wonder whether anyone has come up with a similar ethernet "no-brainer"
solution.

Thanks

Peter    

> > Subject: [SI-LIST] 10 BASE-T RJ45 PCB Design information

> > Might anyone be able to refer me to a good/practical/application
> > document, that relates to issues in implementing a 10 BASE-T RJ45 on a
> > PCB (isolation/EMC/shielding/magnetics/capacitance). While you do get
> > limited "hits" when doing a web search (which do give useful
> > information), possibly someone might be able to suggest a
> > document that they consider an excellent reference.
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